docs: better docs, mv doxygen to sphinx

This patch refactors the VPP sphinx docs
in order to make it easier to consume
for external readers as well as VPP developers.

It also makes sphinx the single source
of documentation, which simplifies maintenance
and operation.

Most important updates are:

- reformat the existing documentation as rst
- split RELEASE.md and move it into separate rst files
- remove section 'events'
- remove section 'archive'
- remove section 'related projects'
- remove section 'feature by release'
- remove section 'Various links'
- make (Configuration reference, CLI docs,
  developer docs) top level items in the list
- move 'Use Cases' as part of 'About VPP'
- move 'Troubleshooting' as part of 'Getting Started'
- move test framework docs into 'Developer Documentation'
- add a 'Contributing' section for gerrit,
  docs and other contributer related infos
- deprecate doxygen and test-docs targets
- redirect the "make doxygen" target to "make docs"

Type: refactor

Change-Id: I552a5645d5b7964d547f99b1336e2ac24e7c209f
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

2 files changed, 1684 insertions, 0 deletions

diff --git a/docs/configuration/config_getting_started.rst b/docs/configuration/config_getting_started.rst
new file mode 100644
index 00000000000..9321ce6a6c8
--- /dev/null
+++ b/docs/configuration/config_getting_started.rst
@@ -0,0 +1,84 @@
+.. _config_getting_started:
+
+=======================================
+Getting started with the configuration
+=======================================
+
+After a successful installation, VPP installs a startup config file named
+*startup.conf* in the */etc/vpp/* directory. This file can be tailored to
+make VPP run as desired, but contains default values for typical installations.
+
+Below are more details about this file and some of the the parameters and values
+it contains.
+
+Command-line Arguments
+----------------------
+
+Before we describe details of the startup configuration file (startup.conf) it
+should be mentioned that VPP can be started without a startup configuration
+file.
+
+Parameters are grouped by a section name. When providing more than one
+parameter to a section, all parameters for that section must be wrapped in
+curly braces. For example, to start VPP with configuration data via the
+command line with the section name *'unix'*:
+
+.. code-block:: console
+
+    $ sudo /usr/bin/vpp unix { interactive cli-listen 127.0.0.1:5002 }
+
+The command line can be presented as a single string or as several; anything
+given on the command line is concatenated with spaces into a single string
+before parsing. VPP applications must be able to locate their own executable
+images. The simplest way to ensure this will work is to invoke a VPP
+application by giving its absolute path. For example:
+*'/usr/bin/vpp <options>'*  At startup, VPP applications parse through their
+own ELF-sections [primarily] to make lists of init, configuration, and exit
+handlers.
+
+When developing with VPP, in gdb it's often sufficient to start an application
+like this:
+
+.. code-block:: console
+
+    (gdb) run unix interactive
+
+
+Configuration File (startup.conf)
+-----------------------------------------
+
+The more typical way to specify the startup configuration to VPP is with the
+startup configuration file (startup.conf).
+
+The path of the file is provided to the VPP application on the command line.
+This is typically at /etc/vpp/startup.conf. If VPP is installed as a package
+a default startup.conf file is provided at this location.
+
+The format of the configuration file is a simple text file with the same content
+as the command line.
+
+**A very simple startup.conf file:**
+
+.. code-block:: console
+
+    $ cat /etc/vpp/startup.conf
+    unix {
+      nodaemon
+      log /var/log/vpp/vpp.log
+      full-coredump
+      cli-listen localhost:5002
+    }
+
+    api-trace {
+      on
+    }
+
+    dpdk {
+      dev 0000:03:00.0
+    }
+
+VPP is instructed to load this file with the -c option. For example:
+
+.. code-block:: console
+
+    $ sudo /usr/bin/vpp -c /etc/vpp/startup.conf
\ No newline at end of file
diff --git a/docs/configuration/reference.rst b/docs/configuration/reference.rst
new file mode 100644
index 00000000000..84b2fd75887
--- /dev/null
+++ b/docs/configuration/reference.rst
@@ -0,0 +1,1600 @@
+.. _configuration_reference:
+
+Configuration Reference
+=======================
+
+Below is the list of some section names and their associated parameters.
+This is not an exhaustive list, but should give you an idea of how VPP can be configured.
+
+For all of the configuration parameters search the source code for instances of
+**VLIB_CONFIG_FUNCTION** and **VLIB_EARLY_CONFIG_FUNCTION**.
+
+For example, the invocation *'VLIB_CONFIG_FUNCTION (foo_config, "foo")'* will
+cause the function *'foo_config'* to receive all parameters given in a
+parameter block named "foo": "foo { arg1 arg2 arg3 ... }".
+
+The unix section
+----------------
+
+Configures VPP startup and behavior type attributes, as well and any OS based
+attributes.
+
+.. code-block:: console
+
+  unix {
+    nodaemon
+    log /var/log/vpp/vpp.log
+    full-coredump
+    cli-listen /run/vpp/cli.sock
+    gid vpp
+  }
+
+nodaemon
+^^^^^^^^
+
+Do not fork / background the vpp process. Typical when invoking VPP
+applications from a process monitor. Set by default in the default
+*'startup.conf'* file.
+
+.. code-block:: console
+
+   nodaemon
+
+nosyslog
+^^^^^^^^
+
+Disable syslog and log errors to stderr instead. Typical when invoking
+VPP applications from a process monitor like runit or daemontools that
+pipe service's output to a dedicated log service, which will typically
+attach a timestamp and rotate the logs as necessary.
+
+.. code-block:: console
+
+   nosyslog
+
+interactive
+^^^^^^^^^^^
+
+Attach CLI to stdin/out and provide a debugging command line interface.
+
+.. code-block:: console
+
+   interactive
+
+log <filename>
+^^^^^^^^^^^^^^
+
+Logs the startup configuration and all subsequent CLI commands in filename.
+Very useful in situations where folks don't remember or can't be bothered
+to include CLI commands in bug reports. The default *'startup.conf'* file
+is to write to *'/var/log/vpp/vpp.log'*.
+
+In VPP 18.04, the default log file location was moved from '/tmp/vpp.log'
+to '/var/log/vpp/vpp.log' . The VPP code is indifferent to the file location.
+However, if SELinux is enabled, then the new location is required for the file
+to be properly labeled. Check your local *'startup.conf'* file for the log file
+location on your system.
+
+.. code-block:: console
+
+   log /var/log/vpp/vpp-debug.log
+
+exec | startup-config <filename>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Read startup operational configuration from filename. The contents of the file
+will be performed as though entered at the CLI. The two keywords are aliases
+for the same function; if both are specified, only the last will have an effect.
+
+A file of CLI commands might look like:
+
+.. code-block:: console
+
+   $ cat /usr/share/vpp/scripts/interface-up.txt
+   set interface state TenGigabitEthernet1/0/0 up
+   set interface state TenGigabitEthernet1/0/1 up
+
+Parameter Example:
+
+.. code-block:: console
+
+     startup-config /usr/share/vpp/scripts/interface-up.txt
+
+gid <number | name>
+^^^^^^^^^^^^^^^^^^^
+
+Sets the effective group ID to the input group ID or group name of the calling
+process.
+
+.. code-block:: console
+
+   gid vpp
+
+full-coredump
+^^^^^^^^^^^^^
+
+Ask the Linux kernel to dump all memory-mapped address regions, instead of
+just text+data+bss.
+
+.. code-block:: console
+
+   full-coredump
+
+coredump-size unlimited | <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Set the maximum size of the coredump file. The input value can be set in
+     GB, MB, KB or bytes, or set to *'unlimited'*.
+
+.. code-block:: console
+
+   coredump-size unlimited
+
+cli-listen <ipaddress:port> | <socket-path>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Bind the CLI to listen at address localhost on TCP port 5002. This will
+     accept an ipaddress:port pair or a filesystem path; in the latter case a
+     local Unix socket is opened instead. The default *'startup.conf'* file
+     is to open the socket *'/run/vpp/cli.sock'*.
+
+.. code-block:: console
+
+     cli-listen localhost:5002
+     cli-listen /run/vpp/cli.sock
+
+cli-line-mode
+^^^^^^^^^^^^^
+
+     Disable character-by-character I/O on stdin. Useful when combined with,
+     for example, emacs M-x gud-gdb.
+
+.. code-block:: console
+
+   cli-line-mode
+
+cli-prompt <string>
+^^^^^^^^^^^^^^^^^^^
+
+     Configure the CLI prompt to be string.
+
+.. code-block:: console
+
+     cli-prompt vpp-2
+
+cli-history-limit <n>
+^^^^^^^^^^^^^^^^^^^^^
+
+     Limit command history to <n> lines. A value of 0 disables command history.
+     Default value: 50
+
+.. code-block:: console
+
+     cli-history-limit 100
+
+cli-no-banner
+^^^^^^^^^^^^^
+
+     Disable the login banner on stdin and Telnet connections.
+
+.. code-block:: console
+
+     cli-no-banner
+
+cli-no-pager
+^^^^^^^^^^^^
+
+     Disable the output pager.
+
+.. code-block:: console
+
+     cli-no-pager
+
+cli-pager-buffer-limit <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Limit pager buffer to <n> lines of output. A value of 0 disables the
+     pager. Default value: 100000
+
+.. code-block:: console
+
+     cli-pager-buffer-limit 5000
+
+runtime-dir <dir>
+^^^^^^^^^^^^^^^^^
+
+     Set the runtime directory, which is the default location for certain
+     files, like socket files. Default is based on User ID used to start VPP.
+     Typically it is *'root'*, which defaults to *'/run/vpp/'*. Otherwise,
+     defaults to *'/run/user/<uid>/vpp/'*.
+
+.. code-block:: console
+
+     runtime-dir /tmp/vpp
+
+poll-sleep-usec <n>
+^^^^^^^^^^^^^^^^^^^
+
+     Add a fixed-sleep between main loop poll. Default is 0, which is not to
+     sleep.
+
+.. code-block:: console
+
+     poll-sleep-usec 100
+
+pidfile <filename>
+^^^^^^^^^^^^^^^^^^
+
+     Writes the pid of the main thread in the given filename.
+
+.. code-block:: console
+
+     pidfile /run/vpp/vpp1.pid
+
+
+The api-trace Section
+---------------------
+
+The ability to trace, dump, and replay control-plane API traces makes all the
+difference in the world when trying to understand what the control-plane has
+tried to ask the forwarding-plane to do.
+
+Typically, one simply enables the API message trace scheme:
+
+.. code-block:: console
+
+   api-trace {
+     api-trace on
+   }
+
+on | enable
+^^^^^^^^^^^
+
+     Enable API trace capture from the beginning of time, and arrange for a
+     post-mortem dump of the API trace if the application terminates abnormally.
+     By default, the (circular) trace buffer will be configured to capture
+     256K traces. The default *'startup.conf'* file has trace enabled by default,
+     and unless there is a very strong reason, it should remain enabled.
+
+.. code-block:: console
+
+    on
+
+nitems <n>
+^^^^^^^^^^
+
+     Configure the circular trace buffer to contain the last <n> entries. By
+     default, the trace buffer captures the last 256K API messages received.
+
+.. code-block:: console
+
+    nitems 524288
+
+save-api-table <filename>
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Dumps the API message table to /tmp/<filename>.
+
+.. code-block:: console
+
+    save-api-table apiTrace-07-04.txt
+
+
+The api-segment Section
+-----------------------
+
+These values control various aspects of the binary API interface to VPP.
+
+The default looks like the following:
+
+.. code-block:: console
+
+   api-segment {
+     gid vpp
+   }
+
+
+prefix <path>
+^^^^^^^^^^^^^
+
+     Sets the prefix prepended to the name used for shared memory (SHM)
+     segments. The default is empty, meaning shared memory segments are created
+     directly in the SHM directory *'/dev/shm'*. It is worth noting that on
+     many systems *'/dev/shm'* is a symbolic link to somewhere else in the file
+     system; Ubuntu links it to *'/run/shm'*.
+
+.. code-block:: console
+
+    prefix /run/shm
+
+uid <number | name>
+^^^^^^^^^^^^^^^^^^^
+
+     Sets the user ID or name that should be used to set the ownership of the
+     shared memory segments. Defaults to the same user that VPP is started
+     with, probably root.
+
+.. code-block:: console
+
+    uid root
+
+gid <number | name>
+^^^^^^^^^^^^^^^^^^^
+
+     Sets the group ID or name that should be used to set the ownership of the
+     shared memory segments. Defaults to the same group that VPP is started
+     with, probably root.
+
+.. code-block:: console
+
+    gid vpp
+
+**The following parameters should only be set by those that are familiar with the
+interworkings of VPP.**
+
+baseva <x>
+^^^^^^^^^^
+
+     Set the base address for SVM global region. If not set, on AArch64, the
+     code will try to determine the base address. All other default to
+     0x30000000.
+
+.. code-block:: console
+
+    baseva 0x20000000
+
+global-size <n>G | <n>M | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Set the global memory size, memory shared across all router instances,
+     packet buffers, etc. If not set, defaults to 64M. The input value can be
+     set in GB, MB or bytes.
+
+.. code-block:: console
+
+    global-size 2G
+
+global-pvt-heap-size <n>M | size <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Set the size of the global VM private mheap. If not set, defaults to 128k.
+     The input value can be set in MB or bytes.
+
+.. code-block:: console
+
+    global-pvt-heap-size size 262144
+
+api-pvt-heap-size <n>M | size <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Set the size of the api private mheap. If not set, defaults to 128k.
+     The input value can be set in MB or bytes.
+
+.. code-block:: console
+
+    api-pvt-heap-size 1M
+
+api-size <n>M | <n>G | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+     Set the size of the API region. If not set, defaults to 16M. The input
+     value can be set in GB, MB or bytes.
+
+.. code-block:: console
+
+    api-size 64M
+
+The socksvr Section
+-------------------
+
+Enables a Unix domain socket which processes binary API messages. See
+.../vlibmemory/socket_api.c.  If this parameter is not set, vpp
+won't process binary API messages over sockets.
+
+.. code-block:: console
+
+   socksvr {
+      # Explicitly name a socket file
+      socket-name /run/vpp/api.sock
+      or
+      # Use defaults as described below
+      default
+   }
+
+The "default" keyword instructs vpp to use /run/vpp/api.sock when
+running as root, otherwise to use /run/user/<uid>/api.sock.
+
+The cpu Section
+---------------
+
+In the VPP there is one main thread and optionally the user can create worker(s)
+The main thread and worker thread(s) can be pinned to CPU core(s) manually or automatically
+
+.. code-block:: console
+
+   cpu {
+      main-core 1
+      corelist-workers 2-3,18-19
+   }
+
+
+Manual pinning of thread(s) to CPU core(s)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+main-core
+^^^^^^^^^
+
+Set logical CPU core where main thread runs, if main core is not set VPP will use
+core 1 if available
+
+.. code-block:: console
+
+   main-core 1
+
+corelist-workers
+^^^^^^^^^^^^^^^^
+
+Set logical CPU core(s) where worker threads are running
+
+.. code-block:: console
+
+   corelist-workers 2-3,18-19
+
+Automatic pinning of thread(s) to CPU core(s)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+skip-cores number
+^^^^^^^^^^^^^^^^^
+
+Sets number of CPU core(s) to be skipped (1 ... N-1), Skipped CPU core(s) are
+not used for pinning main thread and working thread(s).
+
+The main thread is automatically pinned to the first available CPU core and worker(s)
+are pinned to next free CPU core(s) after core assigned to main thread
+
+.. code-block:: console
+
+   skip-cores 4
+
+workers number
+^^^^^^^^^^^^^^
+
+Specify a number of workers to be created Workers are pinned to N consecutive
+CPU cores while skipping "skip-cores" CPU core(s) and main thread's CPU core
+
+.. code-block:: console
+
+   workers 2
+
+scheduler-policy other | batch | idle | fifo | rr
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set scheduling policy and priority of main and worker threads
+
+Scheduling policy options are: other (SCHED_OTHER), batch (SCHED_BATCH)
+idle (SCHED_IDLE), fifo (SCHED_FIFO), rr (SCHED_RR)
+
+.. code-block:: console
+
+   scheduler-policy fifo
+
+scheduler-priority number
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Scheduling priority is used only for "real-time policies (fifo and rr),
+and has to be in the range of priorities supported for a particular policy
+
+.. code-block:: console
+
+   scheduler-priority 50
+
+The buffers Section
+-------------------
+
+.. code-block:: console
+
+   buffers {
+      buffers-per-numa 128000
+      default data-size 2048
+      page-size default-hugepage
+   }
+
+buffers-per-numa number
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Increase number of buffers allocated, needed only in scenarios with
+large number of interfaces and worker threads. Value is per numa node.
+Default is 16384 (8192 if running unprivileged)
+
+.. code-block:: console
+
+   buffers-per-numa 128000
+
+default data-size number
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Size of buffer data area, default is 2048
+
+.. code-block:: console
+
+   default data-size 2048
+
+page-size number
+^^^^^^^^^^^^^^^^
+
+Set the page size for buffer allocation
+
+.. code-block:: console
+
+   page-size 4K
+   page-size 2M
+   page-size 1G
+   page-size default
+   page-size default-hugepage
+
+
+The dpdk Section
+----------------
+
+.. code-block:: console
+
+   dpdk {
+      dev default {
+         num-rx-desc 512
+         num-tx-desc 512
+      }
+
+      dev 0000:02:00.1 {
+         num-rx-queues 2
+         name eth0
+      }
+   }
+
+dev <pci-dev> | default { .. }
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+White-list [as in, attempt to drive] a specific PCI device. PCI-dev is a
+string of the form "DDDD:BB:SS.F" where:
+
+* DDDD = Domain
+* BB = Bus Number
+* SS = Slot number
+* F = Function
+
+If the keyword **default** is used the values will apply to all the devices.
+
+This is the same format used in the linux sysfs tree (i.e./sys/bus/pci/devices)
+for PCI device directory names.
+
+.. code-block:: console
+
+   dpdk {
+      dev default {
+         num-rx-desc 512
+         num-tx-desc 512
+      }
+
+dev <pci-dev> { .. }
+^^^^^^^^^^^^^^^^^^^^
+
+Whitelist specific interface by specifying PCI address. When whitelisting specific
+interfaces by specifying PCI address, additional custom parameters can also be
+specified. Valid options include:
+
+.. code-block:: console
+
+   dev 0000:02:00.0
+   dev 0000:03:00.0
+
+blacklist <pci-dev>
+^^^^^^^^^^^^^^^^^^^
+
+Blacklist specific device type by specifying PCI vendor:device Whitelist entries
+take precedence
+
+.. code-block:: console
+
+   blacklist 8086:10fb
+
+name interface-name
+^^^^^^^^^^^^^^^^^^^
+
+Set interface name
+
+.. code-block:: console
+
+   dev 0000:02:00.1 {
+      name eth0
+   }
+
+num-rx-queues <n>
+^^^^^^^^^^^^^^^^^
+
+Number of receive queues. Also enables RSS. Default value is 1.
+
+.. code-block:: console
+
+   dev 0000:02:00.1 {
+      num-rx-queues <n>
+   }
+
+num-tx-queues <n>
+^^^^^^^^^^^^^^^^^
+
+Number of transmit queues. Default is equal to number of worker threads
+or 1 if no workers treads.
+
+.. code-block:: console
+
+   dev 000:02:00.1 {
+      num-tx-queues <n>
+   }
+
+num-rx-desc <n>
+^^^^^^^^^^^^^^^
+
+Number of descriptors in receive ring. Increasing or reducing number
+can impact performance. Default is 1024.
+
+.. code-block:: console
+
+   dev 000:02:00.1 {
+      num-rx-desc <n>
+   }
+
+vlan-strip-offload on | off
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+VLAN strip offload mode for interface. VLAN stripping is off by default
+for all NICs except VICs, using ENIC driver, which has VLAN stripping on
+by default.
+
+.. code-block:: console
+
+   dev 000:02:00.1 {
+      vlan-strip-offload on|off
+   }
+
+uio-driver driver-name
+^^^^^^^^^^^^^^^^^^^^^^
+
+Change UIO driver used by VPP, Options are: igb_uio, vfio-pci, uio_pci_generic
+or auto (default)
+
+
+.. code-block:: console
+
+   uio-driver vfio-pci
+
+no-multi-seg
+^^^^^^^^^^^^
+
+Disable multi-segment buffers, improves performance but disables Jumbo MTU support
+
+.. code-block:: console
+
+   no-multi-seg
+
+socket-mem <n>
+^^^^^^^^^^^^^^
+
+Change hugepages allocation per-socket, needed only if there is need for
+larger number of mbufs. Default is 256M on each detected CPU socket
+
+.. code-block:: console
+
+   socket-mem 2048,2048
+
+no-tx-checksum-offload
+^^^^^^^^^^^^^^^^^^^^^^
+
+Disables UDP / TCP TX checksum offload. Typically needed for use faster
+vector PMDs (together with no-multi-seg)
+
+.. code-block:: console
+
+   no-tx-checksum-offload
+
+enable-tcp-udp-checksum
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Enable UDP / TCP TX checksum offload This is the reversed option of
+'no-tx-checksum-offload'
+
+.. code-block:: console
+
+   enable-tcp-udp-checksum
+
+The plugins Section
+-------------------
+
+Configure VPP plugins.
+
+.. code-block:: console
+
+   plugins {
+      path /ws/vpp/build-root/install-vpp-native/vpp/lib/vpp_plugins
+      plugin dpdk_plugin.so enable
+   }
+
+path pathname
+^^^^^^^^^^^^^
+
+Adjust the plugin path depending on where the VPP plugins are.
+
+.. code-block:: console
+
+   path /ws/vpp/build-root/install-vpp-native/vpp/lib/vpp_plugins
+
+plugin plugin-name | default enable | disable
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Disable all plugins by default and then selectively enable specific plugins
+
+.. code-block:: console
+
+   plugin default disable
+   plugin dpdk_plugin.so enable
+   plugin acl_plugin.so enable
+
+Enable all plugins by default and then selectively disable specific plugins
+
+.. code-block:: console
+
+   plugin dpdk_plugin.so disable
+   plugin acl_plugin.so disable
+
+Th statseg Section
+^^^^^^^^^^^^^^^^^^
+
+.. code-block:: console
+
+   statseg {
+      per-node-counters on
+    }
+
+socket-name <filename>
+^^^^^^^^^^^^^^^^^^^^^^
+
+Name of the stats segment socket defaults to /run/vpp/stats.sock.
+
+.. code-block:: console
+
+   socket-name /run/vpp/stats.sock
+
+size <nnn>[KMG]
+^^^^^^^^^^^^^^^
+
+The size of the stats segment, defaults to 32mb
+
+.. code-block:: console
+
+   size 1024M
+
+per-node-counters on | off
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defaults to none
+
+.. code-block:: console
+
+   per-node-counters on
+
+update-interval <f64-seconds>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the segment scrape / update interval
+
+.. code-block:: console
+
+   update-interval 300
+
+
+Some Advanced Parameters:
+-------------------------
+
+
+acl-plugin Section
+------------------
+
+These parameters change the configuration of the ACL (access control list) plugin,
+such as how the ACL bi-hash tables are initialized.
+
+They should only be set by those that are familiar with the interworkings of VPP
+and the ACL Plugin.
+
+The first three parameters, *connection hash buckets*, *connection hash memory*,
+and *connection count max*, set the **connection table per-interface parameters**
+for modifying how the two bounded-index extensible hash tables for
+IPv6 (40\*8 bit key and 8\*8 bit value pairs) and IPv4
+(16\*8 bit key and 8\*8 bit value pairs) **ACL plugin FA interface sessions**
+are initialized.
+
+connection hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets (rounded up to a power of 2) in each
+of the two bi-hash tables. Defaults to 64\*1024 (65536) hash buckets.
+
+.. code-block:: console
+
+   connection hash buckets 65536
+
+connection hash memory <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for each of the two bi-hash tables.
+Defaults to 1073741824 bytes.
+
+.. code-block:: console
+
+   connection hash memory 1073741824
+
+connection count max <n>
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the maximum number of pool elements when allocating each per-worker
+pool of sessions for both bi-hash tables. Defaults to 500000 elements in each pool.
+
+.. code-block:: console
+
+   connection count max 500000
+
+main heap size <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the size of the main memory heap that holds all the ACL module related
+allocations (other than hash.) Default size is 0, but during
+ACL heap initialization is equal to
+*per_worker_size_with_slack * tm->n_vlib_mains + bihash_size + main_slack*.
+Note that these variables are partially based on the
+**connection table per-interface parameters** mentioned above.
+
+.. code-block:: console
+
+   main heap size 3G
+
+The next three parameters, *hash lookup heap size*, *hash lookup hash buckets*,
+and *hash lookup hash memory*, modify the initialization of the bi-hash lookup
+table used by the ACL plugin. This table is initialized when attempting to apply
+an ACL to the existing vector of ACLs looked up during packet processing
+(but it is found that the table does not exist / has not been initialized yet.)
+
+hash lookup heap size  <n>G | <n>M | <n> K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the size of the memory heap that holds all the miscellaneous allocations
+related to hash-based lookups. Default size is 67108864 bytes.
+
+.. code-block:: console
+
+   hash lookup heap size 70M
+
+hash lookup hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets (rounded up to a power of 2) in the bi-hash
+lookup table. Defaults to 65536 hash buckets.
+
+.. code-block:: console
+
+   hash lookup hash buckets 65536
+
+hash lookup hash memory <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for the bi-hash lookup table.
+Defaults to 67108864 bytes.
+
+.. code-block:: console
+
+   hash lookup hash memory 67108864
+
+use tuple merge <n>
+^^^^^^^^^^^^^^^^^^^
+
+Sets a boolean value indicating whether or not to use TupleMerge
+for hash ACL's. Defaults to 1 (true), meaning the default implementation
+of hashing ACL's does use TupleMerge.
+
+.. code-block:: console
+
+   use tuple merge 1
+
+tuple merge split threshold <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the maximum amount of rules (ACE's) that can collide in a bi-hash
+lookup table before the table is split into two new tables. Splitting ensures
+less rule collisions by hashing colliding rules based on their common tuple
+(usually their maximum common tuple.) Splitting occurs when the
+*length of the colliding rules vector* is greater than this threshold amount.
+Defaults to a maximum of 39 rule collisions per table.
+
+.. code-block:: console
+
+   tuple merge split threshold 30
+
+reclassify sessions <n>
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets a boolean value indicating whether or not to take the epoch of the session
+into account when dealing with re-applying ACL's or changing already applied ACL's.
+Defaults to 0 (false), meaning the default implementation does NOT take the
+epoch of the session into account.
+
+.. code-block:: console
+
+   reclassify sessions 1
+
+.. _api-queue:
+
+api-queue Section
+-----------------
+
+length  <n>
+^^^^^^^^^^^
+
+Sets the api queue length. Minimum valid queue length is 1024, which is
+also the default.
+
+.. code-block:: console
+
+   length 2048
+
+.. _cj:
+
+cj Section
+----------
+
+The circular journal (CJ) thread-safe circular log buffer scheme is
+occasionally useful when chasing bugs. Calls to it should not be checked in.
+See .../vlib/vlib/unix/cj.c. The circular journal is disables by default.
+When enabled, the number of records must be provided, there is no default
+value.
+
+records <n>
+^^^^^^^^^^^
+
+Configure the number of circular journal records in the circular buffer.
+The number of records should be a power of 2.
+
+.. code-block:: console
+
+   records 131072
+
+on
+^^
+
+Turns on logging at the earliest possible moment.
+
+.. code-block:: console
+
+   on
+
+dns Section
+-----------
+
+max-cache-size <n>
+^^^^^^^^^^^^^^^^^^
+
+Set the maximum number of active elements allowed in the pool of
+dns cache entries. When resolving an expired entry or adding a new
+static entry and the max number of active entries is reached,
+a random, non-static entry is deleted. Defaults to 65535 entries.
+
+.. code-block:: console
+
+   max-cache-size 65535
+
+
+ethernet Section
+-----------------
+
+default-mtu <n>
+^^^^^^^^^^^^^^^
+
+Specifies the default MTU size for Ethernet interfaces.  Must be in
+the range of 64-9000.  The default is 9000.
+
+.. code-block:: console
+
+   default-mtu 1500
+
+heapsize Section
+-----------------
+
+Heapsize configuration controls the size of the main heap. The heap size is
+configured very early in the boot sequence, before loading plug-ins or doing
+much of anything else.
+
+heapsize <n>M | <n>G
+^^^^^^^^^^^^^^^^^^^^
+
+Specifies the size of the heap in MB or GB. The default is 1GB.
+
+.. code-block:: console
+
+   heapsize 2G
+
+ip Section
+----------
+
+IPv4 heap configuration. he heap size is configured very early in the boot
+sequence, before loading plug-ins or doing much of anything else.
+
+heap-size <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set the IPv4 mtrie heap size, which is the amount of memory dedicated to
+the destination IP lookup table. The input value can be set in GB, MB, KB
+or bytes. The default value is 32MB.
+
+.. code-block:: console
+
+   heap-size 64M
+
+ip6 Section
+-----------
+
+IPv6 heap configuration. he heap size is configured very early in the boot
+sequence, before loading plug-ins or doing much of anything else.
+
+
+heap-size <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set the IPv6 forwarding table heap size. The input value can be set in GB,
+MB, KB or bytes. The default value is 32MB.
+
+.. code-block:: console
+
+   heap-size 64M
+
+hash-buckets <n>
+^^^^^^^^^^^^^^^^
+
+Set the number of IPv6 forwarding table hash buckets. The default value is
+64K (65536).
+
+.. code-block:: console
+
+   hash-buckets 131072
+
+l2learn Section
+---------------
+
+Configure Layer 2 MAC Address learning parameters.
+
+limit <n>
+^^^^^^^^^
+
+Configures the number of L2 (MAC) addresses in the L2 FIB at any one time,
+which limits the size of the L2 FIB to <n> concurrent entries.  Defaults to
+4M entries (4194304).
+
+.. code-block:: console
+
+   limit 8388608
+
+l2tp Section
+------------
+
+IPv6 Layer 2 Tunnelling Protocol Version 3 (IPv6-L2TPv3) configuration controls
+the method used to locate a specific IPv6-L2TPv3 tunnel. The following settings
+are mutually exclusive:
+
+lookup-v6-src
+^^^^^^^^^^^^^
+
+Lookup tunnel by IPv6 source address.
+
+.. code-block:: console
+
+   lookup-v6-src
+
+lookup-v6-dst
+^^^^^^^^^^^^^
+
+Lookup tunnel by IPv6 destination address.
+
+.. code-block:: console
+
+   lookup-v6-dst
+
+lookup-session-id
+^^^^^^^^^^^^^^^^^
+
+Lookup tunnel by L2TPv3 session identifier.
+
+.. code-block:: console
+
+   lookup-session-id
+
+logging Section
+---------------
+
+size <n>
+^^^^^^^^
+
+Number of entries in the global logging buffer. Defaults to 512.
+
+.. code-block:: console
+
+   size 512
+
+nthrottle-time <n>
+^^^^^^^^^^^^^^^^^^
+
+Set the global value for the time to wait (in seconds) before resuming
+logging of a log subclass that exceeded the per-subclass message-per-second
+threshold.  Defaults to 3.
+
+.. code-block:: console
+
+   unthrottle-time 3
+
+default-log-level emerg|alert | crit | err | warn | notice | info | debug | disabled
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set the default logging level of the system log.  Defaults to notice.
+
+.. code-block:: console
+
+   default-log-level notice
+
+default-syslog-log-level emerg|alert | crit | err | warn | notice | info | debug | disabled
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set the default logging level of the syslog target.  Defaults to warning.
+
+.. code-block:: console
+
+   default-syslog-log-level warning
+
+mactime Section
+---------------
+
+lookup-table-buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets in the mactime bi-hash lookup table.
+Defaults to 128 buckets.
+
+.. code-block:: console
+
+   lookup-table-buckets 128
+
+lookup-table-memory <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for the mactime bi-hash lookup table.
+The input value can be set in GB, MB, KB or bytes. The default value is 262144
+(256 << 10) bytes or roughly 256KB.
+
+.. code-block:: console
+
+   lookup-table-memory 300K
+
+timezone_offset <n>
+^^^^^^^^^^^^^^^^^^^
+
+Sets the timezone offset from UTC. Defaults to an offset of -5 hours
+from UTC (US EST / EDT.)
+
+.. code-block:: console
+
+   timezone_offset -5
+
+"map" Parameters
+----------------
+
+customer edge
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets a boolean true to indicate that the MAP node is a Customer Edge (CE)
+router. The boolean defaults to false, meaning the MAP node is not treated
+as a CE router.
+
+.. code-block:: console
+
+   customer edge
+
+nat Section
+-----------
+
+These parameters change the configuration of the NAT (Network address translation)
+plugin, such as how the NAT & NAT64 bi-hash tables are initialized, if the NAT is
+endpoint dependent, or if the NAT is deterministic.
+
+For each NAT per thread data, the following 4 parameters change how certain
+bi-hash tables are initialized.
+
+translation hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets in each of the two in/out NAT bi-hash lookup
+tables. Defaults to 1024 buckets.
+
+If the NAT is indicated to be endpoint dependent, which can be set with the
+:ref:`endpoint-dependent parameter <endpointLabel>`, then this parameter sets
+the number of hash buckets in each of the two endpoint dependent sessions
+NAT bi-hash lookup tables.
+
+.. code-block:: console
+
+   translation hash buckets 1024
+
+translation hash memory <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for each of the two in/out NAT
+bi-hash tables. Defaults to 134217728 (128 << 20) bytes, which is roughly 128 MB.
+
+If the NAT is indicated to be endpoint dependent, which can be set with the
+:ref:`endpoint-dependent parameter <endpointLabel>`, then this parameter sets the
+allocated memory size for each of the two endpoint dependent sessions NAT bi-hash
+lookup tables.
+
+.. code-block:: console
+
+   translation hash memory 134217728
+
+user hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets in the user bi-hash lookup table
+(src address lookup for a user.) Defaults to 128 buckets.
+
+.. code-block:: console
+
+   user hash buckets 128
+
+user hash memory <n>
+^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for the user bi-hash lookup table
+(src address lookup for a user.) Defaults to 67108864 (64 << 20) bytes,
+which is roughly 64 MB.
+
+.. code-block:: console
+
+   user hash memory 67108864
+
+max translations per user <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the maximum amount of dynamic and/or static NAT sessions each user can have.
+Defaults to 100. When this limit is reached, the least recently used translation
+is recycled.
+
+.. code-block:: console
+
+   max translations per user 50
+
+deterministic
+^^^^^^^^^^^^^
+
+Sets a boolean value to 1 indicating that the NAT is deterministic. Defaults to 0,
+meaning the NAT is not deterministic.
+
+.. code-block:: console
+
+   deterministic
+
+nat64 bib hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets in each of the two in/out NAT64 BIB bi-hash
+tables. Defaults to 1024 buckets.
+
+.. code-block:: console
+
+   nat64 bib hash buckets 1024
+
+nat64 bib hash memory <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for each of the two in/out NAT64
+BIB bi-hash tables. Defaults to 134217728 (128 << 20) bytes,
+which is roughly 128 MB.
+
+.. code-block:: console
+
+   nat64 bib hash memory 134217728
+
+nat64 st hash buckets <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of hash buckets in each of the two in/out NAT64 session table
+bi-hash tables. Defaults to 2048 buckets.
+
+.. code-block:: console
+
+   nat64 st hash buckets 2048
+
+nat64 st hash memory <n>
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the allocated memory size (in bytes) for each of the two in/out NAT64 session
+table bi-hash tables. Defaults to 268435456 (256 << 20) bytes, which is roughly
+256 MB.
+
+.. code-block:: console
+
+   nat64 st hash memory 268435456
+
+.. _endpointLabel:
+
+endpoint-dependent
+^^^^^^^^^^^^^^^^^^
+
+Sets a boolean value to 1, indicating that the NAT is endpoint dependent.
+Defaults to 0, meaning the NAT is not endpoint dependent.
+
+.. code-block:: console
+
+   endpoint-dependent
+
+oam Section
+-----------
+
+OAM configuration controls the (ip4-icmp) interval, and number of misses
+allowed before reporting an oam target down to any registered listener.
+
+interval <n.n>
+^^^^^^^^^^^^^^
+
+Interval, floating-point seconds, between sending OAM IPv4 ICMP messages.
+Default is 2.04 seconds.
+
+.. code-block:: console
+
+   interval 3.5
+
+physmem Section
+---------------
+
+Configuration parameters used to specify base address and maximum size of
+the memory allocated for the pmalloc module in VPP. pmalloc is a NUMA-aware,
+growable physical memory allocator. pmalloc allocates memory for the DPDK
+memory pool.
+
+base-addr <address>
+^^^^^^^^^^^^^^^^^^^
+
+Specify the base address for pmalloc memory space.
+
+.. code-block:: console
+
+    base-addr 0xfffe00000000
+
+max-size <n>G | <n>M | <n>K | <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Set the memory size for pmalloc memory space. The default is 16G.
+
+.. code-block:: console
+
+    max-size 4G
+
+tapcli Section
+--------------
+
+Configuration parameters for TAPCLI (dynamic tap interface hookup.)
+
+mtu <n>
+^^^^^^^
+
+Sets interface MTU (maximum transmission unit) size in bytes. This size
+is also related to the number of MTU buffers. Defaults to 1500 bytes.
+
+.. code-block:: console
+
+   mtu 1500
+
+disable
+^^^^^^^
+
+Disables TAPCLI. Default is that TAPCLI is enabled.
+
+.. code-block:: console
+
+   disable
+
+
+tcp Section
+-----------
+
+Configuration parameters for TCP host stack utilities. The following
+preallocation parameters are related to the initialization of fixed-size,
+preallocation pools.
+
+preallocated-connections <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of preallocated TCP connections. Defaults to 0.
+The preallocated connections per thread is related to this value,
+equal to (preallocated_connections / (num_threads - 1)).
+
+.. code-block:: console
+
+   preallocated-connections 5
+
+preallocated-half-open-connections <n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the number of preallocated TCP half-open connections. Defaults to 0.
+
+.. code-block:: console
+
+   preallocated-half-open-connections 5
+
+buffer-fail-fraction <n.n>
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the TCP buffer fail fraction (a float) used for fault-injection
+when debugging TCP buffer allocation. Its use is found in *tcp_debug.h*.
+Defaults to 0.0.
+
+.. code-block:: console
+
+   buffer-fail-fraction 0.0
+
+
+tls Section
+-----------
+
+Configures TLS parameters, such as enabling the use of test certificates.
+These parameters affect the tlsmbedtls and tlsopenssl plugins.
+
+use-test-cert-in-ca
+^^^^^^^^^^^^^^^^^^^
+
+Sets a boolean value to 1 to indicate during the initialization of a
+TLS CA chain to attempt to parse and add test certificates to the chain.
+Defaults to 0, meaning test certificates are not used.
+
+.. code-block:: console
+
+   use-test-cert-in-ca
+
+ca-cert-path <filename>
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Sets the filename path of the location of TLS CA certificates, used when
+initializing and loading TLS CA certificates during the initialization
+of a TLS CA chain. If not set, the default filename path is
+*/etc/ssl/certs/ca-certificates.crt*.
+
+.. code-block:: console
+
+   ca-cert-path /etc/ssl/certs/ca-certificates.crt
+
+
+tuntap Section
+--------------
+
+The "tuntap" driver configures a point-to-point interface between the vpp
+engine and the local Linux kernel stack. This allows e.g. users to ssh to the
+host | VM | container via vpp "revenue" interfaces. It's marginally useful, and
+is currently disabled by default. To [dynamically] create TAP interfaces - the
+preferred scheme - see the "tap_connect" binary API. The Linux network stack
+"vnet" interface needs to manually configure, and VLAN and other settings if
+desired.
+
+
+enable|disable
+^^^^^^^^^^^^^^
+
+Enable or disable the tun/tap driver.
+
+.. code-block:: console
+
+   enable
+
+ethernet|ether
+^^^^^^^^^^^^^^
+
+Create a tap device (ethernet MAC) instead of a tun device (point-to-point
+tunnel). The two keywords are aliases for the same function.
+
+.. code-block:: console
+
+   ethernet
+
+have-normal-interface|have-normal
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Treat the host Linux stack as a routing peer instead of programming VPP
+interface L3 addresses onto the tun/tap devices. The two keywords are
+aliases for the same function.
+
+.. code-block:: console
+
+   have-normal-interface
+
+name <name>
+^^^^^^^^^^^
+
+Assign name to the tun/tap device.
+
+.. code-block:: console
+
+   name vpp1
+
+
+vhost-user Section
+------------------
+
+Vhost-user configuration parameters control the vhost-user driver.
+
+coalesce-frames <n>
+^^^^^^^^^^^^^^^^^^^
+
+Subject to deadline-timer expiration - see next item - attempt to transmit
+at least <n> packet frames. Default is 32 frames.
+
+.. code-block:: console
+
+   coalesce-frames 64
+
+coalesce-time <seconds>
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Hold packets no longer than (floating-point) seconds before transmitting
+them. Default is 0.001 seconds
+
+.. code-block:: console
+
+   coalesce-time 0.002
+
+dont-dump-memory
+^^^^^^^^^^^^^^^^
+
+vhost-user shared-memory segments can add up to a large amount of memory, so
+it's handy to avoid adding them to corefiles when using a significant number
+of such interfaces.
+
+.. code-block:: console
+
+   dont-dump-memory
+
+
+vlib Section
+------------
+
+These parameters configure VLIB, such as allowing you to choose whether to
+enable memory traceback or a post-mortem elog dump.
+
+memory-trace
+^^^^^^^^^^^^
+
+Enables memory trace (mheap traceback.) Defaults to 0, meaning memory
+trace is disabled.
+
+.. code-block:: console
+
+   memory-trace
+
+elog-events <n>
+^^^^^^^^^^^^^^^
+
+Sets the number of elements/events (the size) of the event ring
+(a circular buffer of events.) This number rounds to a power of 2.
+Defaults to 131072 (128 << 10) elements.
+
+.. code-block:: console
+
+   elog-events 4096
+
+elog-post-mortem-dump
+^^^^^^^^^^^^^^^^^^^^^
+
+Enables the attempt of a post-mortem elog dump to
+*/tmp/elog_post_mortem.<PID_OF_CALLING_PROCESS>* if os_panic or
+os_exit is called.
+
+.. code-block:: console
+
+   elog-post-mortem-dump